One-step Production of Improved Performance Electrochromic NiO Film by Wet Chemical Method
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Abstract
The high-rise buildings mounted with glass windows to widen scenery of top view of the city become more popular nowadays. These causes the high energy consumption due to the air-condition system to lower the temperature inside the building according to high intensity of daylight penetration and global warming. The electrochromic smart window is one of the most promising ways to diminish the energy consumption. Particularly, nickel oxide is widely used in the electrochromic smart window. This research aims to synthesize nickel oxide film by wet chemical method, which is the simplest and inexpensive. The nickle hydroxide selected as the precursor was hydrolyzed in acid. Annealing temperature and film thickness were modified to achieve the high coloration efficiency. Moreover, the effects of the applied potential and film stability were examined. The results showed that the as-prepared NiO film annealed at 300 °C with the film weight of 10.32 mg is transparent. After applied voltage of 0.55 V vs. Hg/HgO, the film changed to brownish with the light transmission of 37.65%. On the contrary, the film turned to transparent with the light transmission of 86.34% after applied voltage of 0.35 V vs. Hg/HgO. These film exhibited the high coloration efficiency at 188.74 cm2/C. The ability to change in color raised to double after 190 cycles.
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